multiple timeslot reservation

Is it possible to allow reservation of time slot at anytime?

Currently, i realised that the booking timeslot is a radio box.
Which i find it not very user friendly as i have to select a timeslot each time and add to cart. if i need a 3hrs timeslot, i have to add to cart 3 times. assuming my services availability is by the hours.

it is possible to configure it to a checkbox so that user can select and book multiple timeslot.

for instance:
9:00am - 10:00am
10:00am - 11:00am
11:00am - 12:00pm
1:00pm: - 2:00pm
As a user, i can choose a 3hours time slot from 9am to 12pm. and i can add to the cart and checkout.